BPMPD is a research LP code by
Cs. Meszaros,
MTA SzTAKI, Budapest, Hungary
mail: H-1518 Budapest, P.O. Box 63.
e-mail: meszaros@lutra.sztaki.hu
Source for BPMPD is available by ftp for non-commercial use from
netlib ftp servers, e.g.,
ftp://netlib.bell-labs.com/netlib/opt/bpmpd.tar.gz
Source file main.c is an AMPL driver for BPMPD. It assumes
a library form of BPMPD (bpmpd.a on Unix systems) is in the current
directory. (To avoid any confusion with BPMPD source file bpmpd.f,
the driver is "main.c" rather than the more logical "bpmpd.c".)
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solve_result_num values
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Here is a table of solve_result_num values that "bpmpd" can return
to an AMPL session, along with the text that appears in the associated
solve_message.
Value Message
0 Optimal solution found
1 Optimal primal solution; some dual values may be wrong.
200 Primal infeasible (or badly scaled)
300 Dual infeasible (or badly scaled)
510 Execution stopped
520 Ran out of memory
At the moment (5 May 1999), BPMPD does not return correct dual values
for constraints that its presolve phase eliminates. If bpmpd otherwise
appears to solve the problem correctly, solve_result_num = 1.
By adding " presolv=" to $bpmpd_options, you can turn off BPMPD's
presolve phase.